State the speed of light in:
(a) air
(b) water and
(c) glass.
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(a) The speed of light in air is 3 x 108 m s-1.
(b) The speed of light in water is 2.25 x 108 m s-1.
(c) The speed of light in glass is 2 x 108 m s-1.
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What do you understand by refraction of light?
Out of air and glass, which is optically rarer? Give reason.
Which is optically denser: water or air? Give reason.
How does the speed of light determine the optical density of a medium?